IS IS Area
Introduction
Areas
- Each IS-IS device resides in only one area.
- Routing within an area is referred to as Level 1.
- Routing between areas is referred to as Level 2.
Level 2
- Considered the backbone area.
- Level 2 should be contiguous, which means only one L2 area should exist in the ISIS routing domain.
Level 1
- Considered the regular area.